The SLB0686A integrated circuit used in this application is not currently common. The circuit is from a 90s Elektor, applying only to incandescent lamps.
The purpose of the circuit shown in the figure is to open and close the contacts of a relay...
This direct-coupled two-transistor amplifier stage was published in the September 1958 Radio...
I found this circuit in a 1986 English magazine. It can still be easily assembled, replacing the...